/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.compileflow.engine.definition.common;

import com.alibaba.compileflow.engine.definition.common.var.IVar;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author yusu
 */
public interface VarSupport extends HasVar {

    String VARIABLE_TYPE_PARAM = "param";

    String VARIABLE_TYPE_INNER = "inner";

    String VARIABLE_TYPE_RETURN = "return";

    @Override
    default void addVar(IVar var) {
        getVars().add(var);
    }

    default List<IVar> getParamVars() {
        return getVars().stream().filter(var -> VARIABLE_TYPE_PARAM.equals(var.getInOutType()))
            .collect(Collectors.toList());
    }

    default List<IVar> getReturnVars() {
        return getVars().stream().filter(var -> VARIABLE_TYPE_RETURN.equals(var.getInOutType()))
            .collect(Collectors.toList());
    }

    default List<IVar> getInnerVars() {
        return getVars().stream().filter(var -> VARIABLE_TYPE_INNER.equals(var.getInOutType()))
            .collect(Collectors.toList());
    }

    default IVar getReturnVar() {
        return getVars().stream().filter(var -> VARIABLE_TYPE_RETURN.equals(var.getInOutType()))
            .findFirst().orElse(null);
    }

}
